Towards all-IP wireless networks: architectures and resource management mechanism
International Journal of Wireless and Mobile Computing
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Next generation wireless networks are expected tosupport multi-rate multimedia service including widebandservices and to have smaller cell structures likemicro/pico cells. Smaller cells increase the handofftraffics drastically and wideband services cause severenetwork fluctuations with their frequent handoffs. As aresult, it is a challenge to provide stable QoS in thewireless networks. In addition, some wideband servicessuffer from poor QoS under the congestion, wherewideband services have less chances to get enoughresources compared to narrowband services.In this paper, we introduce a region, a logical cell,defined as minimal set of cells, which enables stable callcontrol in the wireless traffic conditions.Then, wepropose two-level Call Admission Control (CAC)mechanism, in which CAC is performed in a region aswe as in a cell. The simulation results show that theproposed CAC mechanism not only guarantees the QoS atany traffic conditions but also improves the QoS. TheCAC also achieves the service fairness by reducing theQoS differences among the services.